Abstract: Conventional doublecomponent grouting pumps have several disadvantages such as low precision of grouting ratio control, long required time to reach the specified ratio, poor stability of grouting flow, and uncontrollable grouting pressure. Therefore, an intelligent doublecomponent grouting pump with two sets of hydraulic systems with independent controls is designed, which can be used to realize an arbitrary injection ratio of doublecomponent grouting. A double gear pump is used to ensure high efficiency and stability of the hydraulic systems and improve the stability of doublecomponent grouting, thereby achieving high precision of the doublecomponent grout injection ratio and a proportional error within 10%.  Simultaneously, the required time to reach the specified ratio is shortened(within 25 s) using a programmable logic controller. A stepped grouting program is set to control the grouting pressure and ensure grouting quality. The grouting test results demonstrate that the proposed pump can be used to realize fine control of doublecomponent grouting and automatic grouting control. The relevant results of the pump application in several projects show that doublecomponent grouting quality is improved and the consumption of grouting material is reduced using the intelligent doublecomponent grouting pump.

Key words: intelligent dualcomponent grouting pump, grouting ratio control, grouting flow, grouting pressure, stepped grouting